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Altered apoptosis pathways in mantle cell lymphoma detected by oligonucleotide microarray
W K Hofmann1, S de Vos, K Tsukasaki
1Division of Hematology and Oncology, Cedars Sinai Medical Center, UCLA School of Medicine, 8700 Beverly Road, Los Angeles, CA 90048, USA. w.k.hofmann@em.uni-frankfurt.de
Blood
|July 27, 2001
Summary
Gene expression analysis reveals that mantle cell lymphoma (MCL) involves altered apoptotic pathways, not just cell cycle dysregulation. Key apoptosis-related genes like FADD, DAXX, CASP2, and RAIDD are significantly down-regulated in MCL.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Cellular apoptosis and survival balance is crucial in lymphoma pathogenesis.
- Mantle cell lymphoma (MCL) is a type of non-Hodgkin lymphoma.
- Understanding gene expression patterns can elucidate disease mechanisms.
Purpose of the Study:
- To compare gene expression patterns in MCL lymph nodes versus nonmalignant hyperplastic lymph nodes (HLs).
- To identify genes and pathways involved in MCL development, focusing on apoptosis regulation.
Main Methods:
- Oligonucleotide microarray analysis comparing gene expression in 5 MCL and 4 HL samples.
- Real-time polymerase chain reaction (PCR) for confirmation using RNA from 16 MCL and 12 HL samples.
- Analysis focused on genes with at least 3-fold down-regulation in MCL.
Main Results:
- Identified 42 down-regulated genes in MCL, indicating altered apoptotic pathways beyond the B-cell leukemia 2 (BCL2) system.
- FAS-associated via death domain (FADD) gene was over 10-fold down-regulated in MCL.
- Other pro-apoptotic genes including DAXX, CASP2, and RAIDD were also decreased in MCL samples.
Conclusions:
- Disturbances in apoptosis pathways contribute significantly to MCL development.
- Combined with cyclin D1 overexpression, altered apoptosis provides a more comprehensive understanding of MCL pathogenesis.
- This suggests potential therapeutic targets within apoptotic pathways for MCL.